Personalized to your biology
Your skin type changes everything.
Vitamin D production varies dramatically by skin type. A Type I person synthesizes vitamin D up to 6x faster than a Type VI under identical conditions. Generic sun trackers ignore this. SunVitD does not.
Fitzpatrick Scale — developed at Harvard Medical School, 1975. Used by dermatologists worldwide.
Why it matters
Vitamin D is one of the most
studied nutrients on earth.
Researchers have published over 60,000 studies on vitamin D. The science is clear: most people in northern latitudes get far less sun exposure than their bodies are designed for. SunVitD helps you understand exactly where you stand — so you can make informed decisions.
Location matters
Above 35° latitude, UV levels drop significantly for months at a time. Most of Europe and North America qualifies. SunVitD shows you exactly what your location means for your sun exposure.
Clouds block more than you think
Overcast skies can reduce UV intensity by up to 90%. SunVitD tracks your missed opportunities and helps you make the most of the windows that matter.
Skin type is not one size fits all
Your Fitzpatrick skin type determines how efficiently your body synthesizes vitamin D. Without calibration, any sun tracker is guessing.
Your numbers, not averages
SunVitD pulls live UV and AQI data for your exact GPS coordinates — not regional estimates. Your reading reflects your actual environment, right now.
How it works
Your personal sun intelligence.
In 3 steps.
We read your environment
SunVitD pulls live UV index and air quality data for your exact GPS location. No guessing — real conditions, right now.
You set your skin type
Using the Fitzpatrick scale, we calibrate vitamin D production to your biology. Darker skin needs more sun — we account for that precisely.
You get your number
Our algorithm estimates how much vitamin D you produced, how long your optimal exposure window is, and how close you are to your daily goal.
Features
Everything you need.
Nothing you do not.
Live UV Index
Real-time UV data from your GPS location
Air Quality
AQI tracking — pollution affects UV intensity
Skin Type Calibration
Fitzpatrick scale personalizes every calculation
Exposure History
Track your sun exposure over days, weeks, months
Burn Risk Timer
Know exactly when to get out of the sun
Daily Sun Report
Morning email with your UV forecast and goals
Missed Windows
See the sun exposure you missed on cloudy days
Science-based Goals
Built on Veugelers & Ekwaru 2014 peer-reviewed research
The science
We read the research.
So you do not have to.
SunVitD is built on peer-reviewed research, including Veugelers & Ekwaru (2014) on vitamin D requirements, and MacLaughlin & Holick (1985) on age-related synthesis differences. Every calculation is grounded in published science — not estimates or averages.
For informational purposes only. Not medical advice. Consult your doctor before changing supplementation.
Pricing
Less than a coffee a month.
Way more useful.
Start free. Upgrade when you are ready.
- ✓ Live UV + AQI readings
- ✓ Vitamin D calculator (3 uses)
- ✓ 7-day history
- ✓ Skin type calibration
- ✓ Everything in Free
- ✓ Full exposure history
- ✓ UV + AQI charts
- ✓ Missed window tracking
- ✓ Daily sun report email
- ✓ Advanced analytics
- ✓ CSV & PDF export
The sun rises tomorrow.
Will you track it?
Join people who stopped guessing and started knowing. Free to start. Takes 30 seconds.
Start Tracking Free